<HTML><HEAD><TITLE>potential_members(?Set, -List)</TITLE>
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<H1>potential_members(?Set, -List)</H1>
List is the list of elements of whose membership in Set is currently uncertain
<DL>
<DT><EM>Set</EM></DT>
<DD>a set or set variable
</DD>
<DT><EM>List</EM></DT>
<DD>variable, will be unified with a list
</DD>
</DL>
<H3>Exceptions</H3>
<DL>
<DT><EM>(4) instantiation fault </EM>
<DD>Set is a variable, but not a set variable
</DL>
<H2>Examples</H2>
<PRE>
    	?- S :: [2,4]..[1,2,3,4,5], potential_members(S, P).
	S = S{[2, 4] \/ ([] .. [1, 3, 5]) : _{[2 .. 5]}}
	P = [1, 3, 5]
    </PRE>

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